As mentioned by @ExpatInJapan here, VentureCraft is coming up with a new Go-DAP that can be used for iDevices and for Desktop/Laptop PCs. Preliminary impressions are that it sounds the pretty much the same as the Go-DAP 4.0 for iPhone 4/4S. It's dropped the proprietary 4/4S jacket and is more like the HP-P1/CLAS type concept (i.e. separate, non-integrated design), but it's slimmer than the HP-P1. It can be used with any current iDevice like the HP-P1, but the added functionality is that there's a switch which will allow it to be used as a PC Desktop/Laptop/Notebook USB DAC too. I believe this is the first such device I'm aware of anyway (not including the patch work of USB DAC+powered up+CCK to the iPad).

The Go-DAP TT is an iDevice/PC USB Audio DAC/Amp that sports a Raytheon 6111SQ tube. It has the same battery as the 3500mAh as the SounDroid Typhoon. Full specs are unknown at the moment but will be updated when known. Price is quoted to be Y79,800 (18th June 2013).

Dooh! Apologies mate, I should have mentioned it to you. Yeah it's basically like the HP-P1, where your iPhone/Touch/iPod sits on top with a separate USB/30-pin Dock cable. Good question about the OpAmp, I'll talk to VentureCraft later next week or early week after to find out about OpAmp options.

I've not reviewed the AD8066 yet. It's Analog Devices (yet another in addition to the Burr Brown & Muses). I'd need to have a listen to the AD8066.

The Go-DAP X is supposedly due around mid-summer. Yes the slim and sleekness is quite attractive actually. I'm still not certain about the volume knob yet. Although it's nice that it's protected but so far I've been used to the protruding-styled volume knob.

Yeah, I know its early days on this device for you too, and its an unknown, just getting my queries out in advance :) heehee.

Excited, now have to decide whether to get the Fostex whilst I wait....hmmm.

Its surprising they didnt think of having a an all in one device (for all ipods/touches/iphones) right off the bat before. Having the Go-Dap only for the iphone4 series severely limited their potential customer base.

Anyway, I am excited about this product, the CLAS is nice and you can choose what amp to combine with it-but expensive, the Fostex is great-but still has that bulk and updating the firmware is troublesome, The DX100 is a great all in one but not all would like the UI.

I saw this briefly on Saturday at the festival. They were showing a leather case that would hold both an iphone as well as this Go-DAP X unit back-to-back. Certainly bulkier than the one that sleeves in the iPhone but maybe certainly less bulky than a iDevice/CLAS/National combo and even slimmer than an iDevice/HP-P1 combo.

I'm pretty rough with my mobile gear so I'm wary of that tiny switch that's used on the Go-DAP 4. I don't know if that small switch is also on the X device? Looks like that is gone.

The VentureCraft guy was saying to me, "it'll work with an iPhone 5." I looked at him quizzically and he explained, "well whatever the next iPhone will be, this will work with that future device."